Amplifiers – Variable impedance for signal channel controlled by separate...
Reexamination Certificate
2006-09-12
2006-09-12
Pascal, Robert (Department: 2817)
Amplifiers
Variable impedance for signal channel controlled by separate...
C330S150000, C330S151000
Reexamination Certificate
active
07106132
ABSTRACT:
A feed-forward operational amplifier including a dedicated summer circuit for summing a signal generated by a first amplifier stage of a feed-forward amplifier and a signal received from an external source to generate a sum signal and a second amplifier stage coupled to the summer circuit and receiving the sum signal. The second amplifier stage realizes a pole-zero doublet to decrease a unity gain frequency of the feed-forward operational amplifier.
REFERENCES:
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patent: 6466091 (2002-10-01), Kejariwal et al.
Thomsen et al., A Five Stage Stabilized Instrumentation Amplifier Using Feedforward Compensation, 1998 Symposium on VLSI Circuits.
Thomsen, Design of Multistage Feedforward Compensated Opamps, IEEE 2001.
Thomsen et al., A 110dB THD, 18mW DAC Using Output Sampling and Feedback to Reduce Distortion, 1999 IEEE Intenational Solid State Circuits Conference.
Thomsen et al., A DC Measurement IC with 130nVpp Noise in 10Hz, 2000 IEEE International Solid State Circuits Conference.
Kewariwal Muari
Prasad Ammisetti
Cirrus Logic Inc.
Murphy James J.
Nguyen Hieu
Pascal Robert
Thompson & Knight LLP
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